Disparate versions of documentation for Python API
There's an URL that redirects you to the most recent API docs:
http://www.blender.org/documentation/250PythonDoc/

Sphinx Doc is used to generate the API documentation. I assume it's the default style we see for our API docs, not sure if Sphinx Doc changed their default or if there was a special stylesheet for 2.59 docs...
http://sphinx-doc.org/

The docs received an own page, they were formerly embedded in the old, dark-themed website (and I welcome this change). It might be the reason why the theme changed, it's no more part of the website and doesn't need to look similar. In the meanwhile, the website theme changed to a bright design, and I would like to see the current Sphinx Doc theme adopted:

Sphinx 1.0.7 - https://docs.python.org/2.7/
Sphinx 1.2.1 - https://docs.python.org/3.4/

The light gray design looks stylish and modern like the new blender.org design

The Wiki is a jungle of 2.4x docs, partially copied over to 2.6 pages and never updated again, some 2.5 guides and screenshots missing newer features, as well as some very up-to-date 2.6x pages - mainly the most frequently accessed pages (introduction, 3d view port...). Too bad Google doesn't accept documentation projects for the Summer of Code, I worry it will stay a blend of old, partially updated and up-to-date pages forever.